JPH03180545A - Weft fixing pin device of loom - Google Patents

Abstract

PURPOSE:To carry out correspondence to high speed operation of loom by combining a fixing pin formed by attaching non-magnetic body stopper and sucking member of ferromagnetic body in the intermediate part of non magnetic plunger with both solenoids capable of carrying out fixing and releasing operations of the fixing pin to improve responsiveness to action. CONSTITUTION:A plunger 11 of a non-magnetic body is movably inserted into a fixing solenoid 21 for moving a fixing pin body 10 to a fixing position and release solenoid 21 for moving to release position. A stopper 12 of non-magnetic body is attached to both sides of the plunger 11 and sucking member 13 of a pair of ferromagnetic bodies are attached to intermediate part of the plunger 11 and both sides thereof and weft fixing part is provided in both ends of the plunger 11 to form the fixing pin body 10 and simultaneously part of plural spacers 25a and 25b inserted between the above-mentioned both solenoids 21 and 22 is moved to the upper surface side of the above-mentioned release solenoid 22 to changeably constitute stroke of the fixing pin body 10. The above- mentioned plunger suppresses leaked flux of magnetic induction between both solenoids in minimum amount and enhances responsiveness of action, because the above-mentioned plunger 11 is non-magnetic body.

Description

[Detailed Description of the Invention] Industrial Field of Application This invention is applicable to a shuttleless loom when unwinding a weft of a predetermined length from a drum-type weft length measuring storage device at a predetermined time and inserting the weft. This invention relates to a weft locking pin device for a loom to be used.

In conventional shuttleless looms, a drum-type weft length measuring and storage device (hereinafter simply referred to as length measuring device) is used to measure and store the weft.
is widely used.

A so-called locking pin is used to unwind the weft stored in the length measuring device by a predetermined length at a predetermined time to perform an accurate weft insertion operation. The locking pin moves back and forth with respect to the surface of the drum on which the weft is wound and stored, and has a locking position that prohibits the weft from being unwound from the drum, and an unwinding position that allows this. You can take it.

In order to stably achieve accurate weft insertion in response to high-speed operation of the loom, it is preferable for the locking pin to operate as fast as possible, and for this reason, a so-called double thread made type locking pin is used. It has been proposed (1986)
-94986).

This device includes a rod-shaped plunger made of ferromagnetic material, a locking solenoid that exerts a magnetic force on the plunger, and an unwinding solenoid.A pin is formed at one end of the plunger, and the locking solenoid and unwinding solenoid The plunger is driven by alternately exciting the pins, and the pin is driven to two positions: a locking position and an unrolling position.

The problem to be solved by the invention is that in the prior art, the pin for locking the weft yarn was formed only at one end of the plunger, so the pin could be locally worn out due to long-term use. However, if the thread hits the pin (scars caused by thread contact; the same applies hereinafter), the entire plunger must be replaced, and depending on the thread type, the plunger's useful life may be too short. , there was a problem that running costs were excessive. In addition, since the entire plunger is made of ferromagnetic material, the overall shape is small and
If a locking solenoid and a releasing solenoid are placed close to each other in order to reduce weight, leakage magnetic flux from one solenoid will link through the plunger to the other solenoid, resulting in unreasonable operation. There was also the problem that it could be slow.

SUMMARY OF THE INVENTION In view of the problems of the prior art, an object of the present invention is to form a plunger made of a non-magnetic material, and fix a suction member made of a ferromagnetic material to the plunger in sections, thereby reducing the leakage between both solenoids. To provide a weft locking pin device for a loom capable of minimizing magnetic flux, improving overall responsiveness, and doubling the service life of a plunger by forming locking parts at both ends of the plunger. It is in.

Means for Solving the Problems The present invention has a configuration that includes a locking pin body, a locking solenoid that drives the locking pin body to a locked position, and a locking pin body that moves the locking pin body to an unrolled position. The lock pin body includes a non-magnetic plunger that is movably inserted into the lock solenoid and the release solenoid, and a non-magnetic plunger that is attached to the middle part of the plunger. It consists of a stopper and a pair of ferromagnetic attracting members fixed to a plunger on both sides of the stopper, and its gist is to form weft locking parts at both ends of the plunger.

In addition, by interposing a plurality of spacers between the locking solenoid and the unwinding solenoid, and moving some of the spacers to the upper surface side of the unwinding solenoid, the stroke of the locking pin body can be changed. Furthermore, the plunger may have different protruding lengths on both sides of the stopper.

In this configuration, a plunger is commonly inserted between the locking solenoid and the releasing solenoid, but since this plunger is made of a non-magnetic material, the magnetic resistance between both solenoids is reduced. However, there is no risk of the magnetic flux being unduly reduced through the plunger, and therefore, leakage magnetic flux between both solenoids can be suppressed to a small level, and response speed can be improved. In addition, since weft thread locking parts are formed at both ends of the plunger, if the yarn hits one of the locking parts, you can use a new locking part by turning the plunger upside down. is possible.

The spacer interposed between the locking solenoid and the releasing solenoid determines the distance between the locking solenoid and the releasing solenoid, and by moving the stopper within this distance, the stroke of the locking pin body can be determined. can. Therefore, by dividing this spacer into multiple parts and moving some of them to the upper surface of the unwinding solenoid, the stroke of the locking pin body can be easily changed by changing the interval for the stopper to move. be able to. In addition, the locking pin body is
The smaller the stroke, the better the responsiveness and the ability to adapt to high-speed operation of the loom, but there is a limit to the minimum stroke depending on the thickness of the weft used.

When using a plunger with different protrusion lengths on both sides of the stopper, the locking pin body can be driven to the locking position by using one locking part with a different protrusion length depending on the length of the stroke. Sometimes, the depth at which the lock penetrates into the drum surface can be constant.

Example Examples will be described below with reference to the drawings.

A weft locking pin device for a loom (hereinafter simply referred to as a locking pin device) has a locking pin main body 10, a locking solenoid 21, and an unwinding solenoid 22 as main components (Fig. 1), and a body. It is housed integrally in a case consisting of a cover 23 and a cover 24.

The body 23 includes the locking pin main body 10. Locking solenoid 21
, a space 23a for housing components including the unwinding solenoid 22, the locking solenoid 21, and the unwinding solenoid 2.
It is a container-shaped member that has a space 23b for drawing out electric wires from the wire (FIG. 2). The bottom of the body 23 is provided with a through hole 23c through which the locking pin main body 10 passes, and a tongue piece 23e with a mounting hole 23d for housing an unwinding sensor is provided at the lower front surface. It is a protruding structure. Moreover, a screw hole 23f for screwing the entire body to the bracket BK is formed in the upper part of the back surface. However, here, the unwinding sensor is a sensor for detecting a weft (not shown) unwound from the drum D of the length measuring device, and for example, a reflective optical sensor with an optical lens can be used. .

The cover 24 is fixed to the upper surface of the body 23 via setscrews 24c, 24c (FIG. 3), and has a through hole 24a through which the locking pin body 10 passes, and a wire extraction hole 24b.

However, it is assumed that the through holes 24a correspond to the through holes 23c of the body 23, and are located on the axis CL of the space 23a (FIG. 2).

The locking solenoid 21 and the unwinding solenoid 22 are housed in a space 23a of the body 23 in two layers (FIGS. 1 and 3).

The locking solenoid 21 and the unwinding solenoid 22 are assembled into a cylindrical shape by combining cylindrical solenoid holders 21a and 22a and flanged bobbins 21b and 22b, respectively, and two ring-shaped spacers with different thicknesses. 25
a and 25b. Locking solenoid 21
, the other end side of the unwinding solenoid 22 has yokes 21d, 2
2d is installed. Here, the solenoid holder 21
a s 22 a % bobbin 21b, 22b, yoke 2
1d and 22d are each made of ferromagnetic material,
It is preferable that the spacers 25a and 25b are made of non-magnetic material. The yokes 21d and 22d have bushings 26.26.
are assembled into one piece.

The locking pin main body 10 is formed by fitting a disk-shaped stopper 12 into the center of a non-magnetic plunger 11, and further fixing cylindrical suction members 13 and 13 to both sides of the stopper 12. . The plunger 11 is movably pushed through the locking solenoid 21 and the unwinding solenoid 22 via the yokes 21d and 22d and bushes 26 and 26. That is, the plunger 11 penetrates the through hole 23c of the body 23 and the through hole 24a of the cover 24, and enters the space 2 of the body 23.
It is movably inserted along the axis CL of 3a. The plunger 11 is made of a non-magnetic material, for example,
It is preferable to use a bar made of stainless steel, ceramics, or the like.

The attraction member 13.13 is made of ferromagnetic material, and the yoke 21d
, 22d are formed as slopes, and at the stroke limit, a minute gap δ is formed between the end surfaces of the yokes 21d and 22d, which are also formed on slopes.
We shall meet face-to-face via . The stopper 12 is made of a non-magnetic material, and when the locking pin main body 10 moves, the locking solenoid 21 and the bobbin 21b12 of the unwinding solenoid 22 are stopped.
It comes into contact with the flange surface of 2b to regulate its stroke limit.

The locking pin main body 10 is formed so that both ends of the plunger 11 can be used as locking portions for weft threads. Also,
Its dimensions are: thickness ds of the stopper 12, protrusion length Ll on both sides of the stopper 12, L2, total length L=ds +L1
+L2 (FIG. 3), when the stopper 12 is set at Ll-L2 and one side of the stopper 12 is brought into contact with the bobbin 21b of the locking solenoid 21, one tip of the plunger 11 matches the stroke of the locking pin body 10. It is assumed that it protrudes from the lower surface of the body 23 by the same length as d (FIG. 1). However, the stroke d is the thickness d of the spacers 25a and 25b.
8, for db, d = da + db - ds = do - ds, where do = da + dl) is the locking solenoid 2 determined by the thickness of the spacers 25a, 25b.
1. The distance between the unwinding solenoid 22.

In the locking pin device having such a configuration, the locking pin main body 10 is inserted through the bracket BK so that it can move forward and backward with respect to the surface of the drum D in the vicinity of the front end surface of the drum AD of the length measuring device. Attach it to the length measuring device (Figure 2). A hollow rotating yarn guide D1 is disposed behind the drum D, and the weft (not shown) is supplied by passing through the interior of the rotating yarn guide DI, and as the rotating yarn guide Di rotates, the surface of the drum D is The windings are stored.

An electric wire 01C with a connector CI SC1 is pulled out from the locking solenoid 21 and the unwinding solenoid 22, and connected to a solenoid drive device (not shown).

Now, when the locking solenoid 21 is energized, the locking pin body 10 is driven downward in FIG.
If the gap dd between the drum D and the drum D is set to dd - d, the tip of the locking pin main body 10 will enter the surface of the drum D and assume the locking position (see the same figure). The attachment can prevent the stored weft from unwinding in the direction of the arrow in FIG. In this case, the depth dk at which the tip of the locking pin main body 10 enters the drum D is d
k = d-dd.

When the locking solenoid 21 is demagnetized and the unwinding solenoid 22 is energized, the locking pin main body 10 is driven upward in FIG. Since the gap dd with the drum D becomes free, unwinding of the weft from the drum D can be allowed. Note that at this time, the number of turns of the weft yarn unwound from the drum D can be counted by an unwinding sensor (not shown) inserted into the attachment hole 23d.

When the locking solenoid 21 is excited, most of the magnetic flux circulates through the magnetic circuit consisting of the bobbin 21b1 made of ferromagnetic material, the solenoid holder 21a, the yoke 21d, and the attraction member 13 on the side corresponding to the locking solenoid 21. do. Therefore, if the body 23 and the spacer 25 are made of a non-magnetic material such as aluminum, there is almost no possibility that the leakage magnetic flux from the locking solenoid 21 will link to the unwinding solenoid 22. .

The same applies to the case where the unwinding solenoid 22 is energized. Therefore, the leakage magnetic flux between the locking solenoid 21 and the unwinding solenoid 22 can be made sufficiently small, so that when one of them is energized, the locking The actuation of the pin body 10 can be very responsive.

The tip of the plunger 11 on the side that protrudes downward from the body 23 may be hit by a thread due to long-term use.

In that case, remove the cover 24 and lock the locking pin body 10.
A new tip can be used by flipping it upside down.

In addition, the weft thread locking part formed at the tip of the plunger 11 is made by forming the plunger 11 itself from a hard wear-resistant material, or at least by coating the tip with a hard material so as to prevent the yarn from hitting the thread. It is preferable to keep it.

Other Embodiments In the previous embodiment, if the spacer 25b with the thickness db is moved to the upper surface of the unwinding solenoid 22 (FIG. 4), the stroke of the locking pin body 10 will be d1=da-ds<d
can be shortened to At this time, the locking pin body 10
By shortening the protrusion length of the locking solenoid 21 example to L2-db, it is possible to make the tip of the locking pin body 10 coincide with the lower end of the body 23 when the locking pin body 10 is driven to the unrolled position. can. However, in this case, the body 23 is arranged so that the entire length measuring device is brought close to the drum D so that the gap between the body 23 and the drum D satisfies ddl=dl-dk<dd.

Generally, the spacers 25a and 25b interposed between the locking solenoid 21 and the unwinding solenoid 22 are divided into two or more arbitrary pieces, and a part of them is moved to the upper surface side of the unwinding solenoid 22. Accordingly, the stroke of the locking pin main body 10 can be changed arbitrarily. At this time, the protrusion length L2 of the plunger 11 on the locking solenoid 21 side is
When the locking pin main body 10 is driven to the unrolled position, it is preferable to set its tip so that it coincides with the lower end of the body 23.

Further, when the locking pin body 10 is driven to the locking position, the depth dk at which the tip end enters the drum D is preferably kept constant regardless of the stroke of the locking pin body 10. This is because if the depth dk is too large, the response time of the locking pin main body 10 will be long, and if the depth dk is too small, the locking operation of the weft may become unstable.

As described in detail, the present invention includes a non-magnetic plunger, a non-magnetic stopper attached to an intermediate portion of the plunger, and a pair of ferromagnetic attraction members fixed to both sides of the stopper. By combining the locking pin body made of As a result, the responsiveness of the entire operation can be significantly improved, and it can sufficiently cope with high-speed operation of the loom.In addition, by forming weft locking parts at both ends of the plunger, the service life of the locking pin body can be shortened. It has the excellent effect of doubling the amount of

[Brief explanation of drawings]

1 to 3 show an embodiment, in which FIG. 1 is an explanatory central vertical cross-sectional view, FIG. 2 is an explanatory view of the state of use, and FIG. 3 is an exploded perspective explanatory view. FIG. 4 is a diagram corresponding to FIG. 1 showing another embodiment. 10... Locking pin body 11... Plunger 12... Stopper 13... Suction member 21... Locking solenoid 22... Unwinding solenoid 25a, 25b... Spacer

Claims (1)

[Scope of Claims] 1) A locking pin body, a locking solenoid that drives the locking pin body to a locking position, and an unwinding solenoid that drives the locking pin body to an unwinding position, The locking pin body includes a non-magnetic plunger that is movably inserted into the locking solenoid and the unwinding solenoid, a non-magnetic stopper that is attached to an intermediate portion of the plunger, and both sides of the stopper. A weft locking pin device for a loom, comprising a pair of ferromagnetic suction members fixed to the plunger, and a weft locking portion is formed at both ends of the plunger. 2) A plurality of spacers are interposed between the locking solenoid and the unwinding solenoid, and a part of the spacers is moved to the upper side of the unwinding solenoid to change the stroke of the locking pin body. A weft locking pin device for a loom according to claim 1, characterized in that the weft locking pin device for a loom is capable of 3) The weft locking pin device for a loom according to claim 2, wherein the plunger has different protruding lengths on both sides of the stopper.